Finding the Fourth Proportional to 1,275.91, 1,760.86 and 716.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.91 : 1,760.86 = 716.42 : x
2. Step 2: Convert to fraction form
   1,275.91/1,760.86 = 716.42/x
3. Step 3: Cross multiply
   1,275.91x = 1,760.86 × 716.42
4. Step 4: Simplify right side
   1,275.91x = 1,261,506.93
5. Step 5: Solve for x
   x = 1,261,506.93/1,275.91
6. Step 6: Final answer
   x = 988.71